Field experiments conducted on cultivators fields indicated that green gram responded significantly to applied P up to the level of 40 kg P2O5 ha−1 in low and medium P soils and up to 20 kg P2O5 ha−1 in high P soils. Magnitude of response to added P decreased sharply both with rise in available soil P status and at higherievels of P application. Organic carbon influenced magnitude of response to added P and relatively higher yield production was observed in soils testing > 0.40 per cent organic carbon. Moreover, organic carbon content of soils correlated significantly with grain yield in control plots. Soil texture also affected the nature of response to added P and relatively higher grain yield production was observed in fine textured soils. The results suggest that in addition to Olsen's extractable P, soil texture and organic carbon content are the determining factors in deciding response of added P.
Available P, soil texture, organic carbon, green gram
